Composition



Patented July 19 27.

UNITED STA res P ATENT OFFICE.

cmrmiwr. name AND WILLIAM- A. mm, on MILWAUKEE, wxsoousm; sen); n nerrz..assrenon ro sun name.

No Drawing The invention relates to. grinding compositions ,and particularly to acom osition and the method of making and app ying it to grinding discs. 5 It isan object of the invention to provide aniinproved composition which retains its abrasive properties for a relatively long period. n p A further object of the invention constitutes the provision of a compound which will 'not be impaired in its inding elficiency by the process of dust col e'cting thereon durin the grinding operation.

A furt er object comprises the provision of {a composition which may be preserved for an indefinite length of time, without losing its properties.

A further, object of the invention is to provide an improved compositionthat can be furnished in a semi-solid form and be directly applied to a steel surface or the like without a fabric backing.

' A fiirther objecfiof the invention is to provide an improved composition which will 5 permit the carborundum points to protrude beyond the surface of the binding compound thus making accessible the desirable cutting surface of the carborundum to engage the article being ground of polished. A further; object of the invention is to provide an improved composition which does not require being baked but simply needs only-to be exposed to a drying temperature of 90 F.

With these and dther objects in View which will become apparent upon a perusal of the-followin specification taken in connection with tie claims forming a part thereof; the preferred comp prises the particular ingredients used in proper proportion to meet 'the most exact-. ing requirements, which 'include' the following asbestos; retort cement, ;carborundum, silica of soda and. water.

In compounding these ingredients the.following procedure has given the best results:

To Number 40, asbestos retortfcement supplied to the trade as such, and known as such,- a. suitable quantity of carborltndum-is added and the whole mixed with silica-of soda and-water to constitute a heavy mass,v resembling wet sand. 'This mixture is .-ap-

plied to. the surface ofa steel dis}, which is later to employed inj the grinding operaosit-ion' comoomrosrrIoN.

Application @1311 April 1, 1925. Serial No. 19,978.

tion of surfaces and then subjected to a drying temperature of about 90 1*. thisdrying process the grinding materials contract so that the short carborundum points will portrude beyond it. This condition is very advantageous as the cement During dustt'hus freed during the grinding act-ion would settle on vthe grindingdisc will not then impair the efiicient grinding action thereof.

Instead of u'singcarborundum a suitable quantity of aloxite-may be employed. The

' composition is usually packed in air tight cans where 'it may be maintained for an indefinite period of time; in proper condition, or the composition may be furnished in disc form known to the trade as glue bond form in'which case a canvas or other fabric baked disc of the improved composition is made up ready to be fastened tothe steel disc. In preparing the composition thefollowing preferred proportions of ingredients are chosen: 3 lbs. Number 40 asbestos retort cement in dry form, 16 lbs. of carborundum, 1 gallon of silica of soda and water suflicientto yield a heavy mixture.

If aloxite is used instead of 'carborundum the following proportions are preferred: 3 lbs. of retort cement, 18lbs. of aloxite, 1 gallon of silica of soda and water sufii cient to yield a heavy mixture,

While the specification refers to certain ingredients used in suitable proportions the jfquivalents of,sucl1 ingredients and variaions in the proportions used may be changed within the scope-of the invention as defined by the appended claims.

We claim: 1. A new-combination of. matter comprisihg retort cement, carborundum, silica of soda and water.

2. A new combination of matter comprising Number 4 0 asbestos retort cement, car-.

borundum, silica of=soda and water;

3. A new combination of matter compris ing retort cement, carborundum, silica. of ,soda and water, said composition having the carborundum points prptruding after drymg I v product composed of retort cement, carbo rundum, silica of soda and water, the whole 4; As a new article of manufacture a' a ing 3 lbs. of retort cement, 16 lbs. of carborundum, 1 gallon silica of soda andwater suflicient to produce a heavy mixture.

6. A new composition of matter" comprisin retort cement, carborundum, silica of soda and water, said composition being dried at a temperature of about 90 F.

7. The proce'm of forming a grinding composition, which comprises mixing a quantity of cement with an abrasive substance, then combining silica of soda and water in proper proportion to form a heavy mixture, then applying the.mixture thus obtained in plastic state to a metal foundation, such as a steel disk, and then subject- I ing the mixture so applied to a drying temperature of 90 F. to cause the binding substance to contract and cause the abrasivematerial to protrude.

8. The process of forming an abrasive substance, comprising combining 3%; lbs. of retort cement, then addinglfi lbs. of carborundum, then addin 1 gallon .of silica of soda and Water su oient to, produce a heavy mixture, and subjecting the Whole mixture to a drying temperature of 90 F.

to contract the binder and cause the carborundum to protrude.

In testimony whereof, I afiix my signature at 115 Grand Ave, Milwaukee, Wisconsin.

MATHEW P. IDING.

-WILLIAM A. NIMTZ. 

